Problem doing Differential ADC1 MQX4.0, CW10.2 & PE

cavebiker — Tue, 09 Apr 2013 22:05:11 GMT

I am using a K40 Tower System with MQX4.0 CW10.3 and cannot get the ADC to do differential mode.

I used PE to set it up. ADC1, Differential, input-> PGA1_DP/ADC1_DP0/ADC0_DP3 and negatice ->PGA1_DM/ADC1_DM0/ADC0_DM3, Conversion time : 9.615385 µs, High voltage reference Vrefh_1_2V, Low voltage reference Vrefl_1_2V

My code from the example PE stuff builds and runs but all I get is 56891 to 56897, no matter what I put on the input lines ADC1_DP0 & ADC1_DM0.

Here is the code:

void main_task(uint_32 initial_data)

{

uint_16 atodValue;

MyADCPtr = AD1_Init((LDD_TUserData *)NULL); /* Initialize the device */

printf("\n\n-------------- Begin TJs Differential ADC example --------------\n\n");

while (TRUE)

{

_time_delay(5);

SampleGroup[0].ChannelIdx = 0U; /* Create one-sample group */

Error = AD1_CreateSampleGroup(MyADCPtr, (LDD_ADC_TSample *)SampleGroup, SAMPLE_GROUP_SIZE); /* Set created sample group */

Error = AD1_StartSingleMeasurement(MyADCPtr); /* Start continuous measurement */

//_time_delay(2); //while (!AD1_GetMeasurementCompleteStatus(MyADCPtr)) {}; /* Wait for conversion completeness */

while (ADC1_SC2 & 0x080);

Error = AD1_GetMeasuredValues(MyADCPtr, (LDD_TData *)MeasuredValues); /* Read measured values */

printf("%5d,\n ", *MeasuredValues);

}

printf("\ndone!\n");

_task_block();

}

Any help or ideas is much appreciated.

Thanks and cheers,

Tom

Re: Problem doing Differential ADC1 MQX4.0, CW10.2 & PE

cavebiker — Fri, 26 Apr 2013 19:09:11 GMT

I'm back onto this differential A/D stuff Monday. Anyone with any experience doing differential with a Kinetis Tower System. I'm just trying to help out an analog dude so he can test performance, it just needs it to work.

Cheers!

Re: Problem doing Differential ADC1 MQX4.0, CW10.2 & PE

cavebiker — Wed, 01 May 2013 19:44:25 GMT

Never mind, there is something goofy about how the ADCO_DP0 & DM0 run out to the tower card A27 & A28. I soldered wires right to the main board and all is good.

Also, PE Rocks!

Cheers,

Tom

Re: Problem doing Differential ADC1 MQX4.0, CW10.2 & PE

Monica — Wed, 01 May 2013 22:43:26 GMT

G R E A T !

:smileygrin:

topic Re: Problem doing Differential ADC1 MQX4.0, CW10.2 & PE in Kinetis Microcontrollers

Problem doing Differential ADC1 MQX4.0, CW10.2 & PE

Re: Problem doing Differential ADC1 MQX4.0, CW10.2 & PE

Re: Problem doing Differential ADC1 MQX4.0, CW10.2 & PE

Re: Problem doing Differential ADC1 MQX4.0, CW10.2 & PE